怎样建立膨胀机油循环？

目前房地产价格水平越高，则房地产价格上涨趋势越强。（）

Exciting as its special effects are ______, there is too much violence in the film.[ ]

A. to watch

B. to be watched

C. watching

D. being watched

( )是公安工作的根本态度。

A．一切依靠群众

B．从群众中来，到群众中去

C．一切为了群众

D．服务群众，保护群众

_____ many   countries in Latin America have been trying to reduce gaps in   income,

America has allowed inequality to grow.     [ ]

A. While            

B. Since        

C. If            

D. Where

光纤收发器正常运行时，如果交换机到光纤收发器之间网线有问题，UPS指示灯应呈现（）。

A.红色

B.绿色

C.绿色闪

D.灭